pub struct Key<T> {
    os: OsStaticKey,
    marker: PhantomData<Cell<T>>,
}
🔬This is a nightly-only experimental API. (thread_local_internals)
Expand description

Use a regular global static to store this key; the state provided will then be thread-local.

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§os: OsStaticKey
🔬This is a nightly-only experimental API. (thread_local_internals)
§marker: PhantomData<Cell<T>>
🔬This is a nightly-only experimental API. (thread_local_internals)

Implementations§

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impl<T: 'static> Key<T>

const: unstable · source

pub fn new() -> Key<T>

🔬This is a nightly-only experimental API. (thread_local_internals)
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pub unsafe fn get(&'static self, init: impl FnOnce() -> T) -> Option<&'static T>

🔬This is a nightly-only experimental API. (thread_local_internals)

It is a requirement for the caller to ensure that no mutable reference is active when this method is called.

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unsafe fn try_initialize( &'static self, init: impl FnOnce() -> T ) -> Option<&'static T>

🔬This is a nightly-only experimental API. (thread_local_internals)

Trait Implementations§

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impl<T> Debug for Key<T>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T> Sync for Key<T>

Auto Trait Implementations§

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impl<T> !RefUnwindSafe for Key<T>

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impl<T> Send for Key<T>where T: Send,

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impl<T> Unpin for Key<T>where T: Unpin,

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impl<T> !UnwindSafe for Key<T>

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.